Accounting Policies and Supplemental Disclosures - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| SUPPLEMENTAL CASH FLOW INFORMATION: | ||||
| Cash paid for interest on debt, net of capitalized interest | $ 274 | $ 236 | $ 1,496 | $ 1,825 |
| Cash paid for operating leases | 4,315 | 3,562 | 15,791 | 12,571 |
| Cash paid for interest on finance leases | 102 | 71 | 326 | 284 |
| Cash paid for interest on financing obligations | 76 | 55 | 217 | 210 |
| Cash paid for income taxes, net of refunds | 1,323 | 877 | 8,741 | 12,727 |
| Assets acquired under operating leases | 6,239 | 4,321 | 21,848 | 15,992 |
| Property and equipment acquired under finance leases, net of remeasurements and modifications | 1,565 | 54 | 4,422 | 866 |
| Increase (decrease) in property and equipment acquired but not yet paid | $ 9,920 | $ 3,108 | $ 16,967 | $ 9,736 |